An article reported that for a sample of 44 kitchens with gas cooking appliances monitored during a one-week period, the sample mean CO2 level (ppm) was 654.16, and the sample standard deviation was 163.02.   (b) Suppose the investigators had made a rough guess of 182 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of 60 ppm for a confidence level of 95%? (Round your answer up to the nearest whole number.)

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